Supporting pole for electrical conductors



Dec. 30; 1930. R. c. ROE

SUPPORTING POLE FOR ELECTRICAL CONDUCTORS m a a h li u 44 I a M p M p m@s a N 4 i G l 8 F. gs 1 w Z%%@%fifi\\w$%p% 1 A -M m Y M D. H 2 M M W Z lr a Dec. 30, 1930. R. c. ROE

SUPPORTING POLE FOR ELECTRICAL CONDUCTORS Filed April 25, 1928 4Sheets-Sheet 2 \NVENTOR W z. 02$

N FIG4 Dec. 30, 1930. R. c. ROE.

SUPPORTING POLE FOR ELEC TRICAL CONDUCTORS Filed April 25. 1928 4Sheets-Sheet a INVENTOR 0&4 z W FIG 6 Dec. 30, 1930. c, O

SUPPORTING POLE FOR ELECTRICAL c oNDUc'roRs 4 Sheets-Sheet Filed April25, 1928 F\G U |NVENT% W 6, w

FIG \0 i UNITED p;

ing at the insulating blocks.

Patented Dec. '30, 1930 RALPHVVC. Ron, OFVENGLEWOODQQNIEW"JERSEY,assmnoa-o on nam TO STEPHEN-Y a w. 18031315111, 01 SUMMIT, new JERSEYSUPPORTING 'i'onnron ELECTRICAL oonnuc'rons Application filed, Apri125,1928. serialNo. 272,841.

. This invention relates to improvements in manufactured structures forsupporting electrical wires such as poles, towers, cross-arms andsuspension insulators. p

The object of theinventionis to improve such structuresby constructingthem in such manner that a substantial amount of elec tricalinsulationis introduced between those port-ions thereof which areadjacent to the electrical conductors andithose portions which are inelectricalcontact with ornearto the earth or which are in the electricalpath be tween the conductor andtheearth, r The invention. comprlsesthetypes of construction described and. claimed hereinafter inconnection with the draw1ngs=and equrva-' lents thereo f of wlii'ch' V vFig.1 a frontelevationofa hollow pole, consisting of three sections andhaving in sulating" blocks interposedbetween the sections and havingtensionmembers terminat- Fig. 2 isa horizontal cross section taken at2+2 of 1.

Fig. 3 is a vertical cross section between 11 and- 22of Fig. l andon thecenter line 33 of Fig.2. v

Fig. 4 isa frontelevation' of a threesection hollowpole with insulatingblocks be tween the sections and; having the tension members equipped-with strain insulators, the I tension ineinbersbeing terminated at theends of the complete assembly. v r

Fig. 5 is a horizontalcross section'taken at Fig.- 6 isaverticalcrosssection of the portion 22, 3 3 015 (36 of Fig. 5.

Tisaportion of a pole in whichthe exterior inembers are of metal ofSllfilClGDb thickness to be self supporting and having insulatingblocksbetween thc sections and means for attaching-the ad acent portionsof the pole to the insulating blocks, a per tion'of the pole being cutawayto show the fastening. g

"Fig. 8 is a vertical cross section of Fig. 7 taken thrirthe centerrofthepole.

Fig. 9 isa front elevationfof aportion of a twosectionpole in which thebottom portion Fig. 4,]on the center line is of insulating inaterialandthe top portion top and bottom of the ,pole. :There is no insulatingblockbetween the sectionso f the pole. t

use as across-arm .or as a suspensionqlineinsu'lator. The exteriormember is ofinsulating material and the tension V member .is providedwithinsulating sections, a ,portonjof Fig. 510 isla structure ofsuitable form for theexterior. member being: cutaway to showELIllIlSLllLtlIlg section.-

, Fig. 11 is, a vertical cross section thruIthe.

centerof a structure suitablefor usefas a suspensionline insulator, boththe. exterior; compression member and the interior tension member. beingof. insulating material, the balanceofthe hollow interior beingfilledwith insulating orarc quenchingliquid.

, Fig. 12 illustrates the method ofusingthe structure of Fig.11 as asuspension insulator,

a steel tower being shown for illustrating purposes only.

Inrecent yearsthe use of wood poles and to :thet'act that Woodfpoles arebecoming increasingly expensive, but because it is difficult to securepoles of sufficient height and strength forusein connection with presentday high tension systems. Tubular metal polesandpolesconstructedofconcrct-e and,

othertypesof meta-l polesand structures are now-being employedforsupporting high tensionwires.

structure of Fig. as a cross-armand the 1 Hightensionwires must beinsulated from each other, and from the earth,-and the-ma w jorproblemis to insulate them from the ea'rth.

For instance, if there is a potential of100,000

Voltslbetween two conductors vandlbetween v those conductors-and theearth, it isneces'sary tolprovi de foreach conductor an individualinsulatorhaving an insulating value suitablefor a potential of 100,000volts, whereas the. conductors would be suificiently insulated from eachother if each were equipped with an insulator suitable for a potentialof 50,000

volts, since the two insulators are in series with respeotto thepotential between the two wires. Furthermore, there are other factors,such as induced voltages caused by lightning, etc., which still furtherincreases the potential between the conductors and the earth withoutincreasing the potential between conductors.

An individual pole or structure may support many conductors, let us say,for instance, nine conductors having a potential of 100,000 voltsbetween conductors. It ismore or less apparent that if the nineconductors are each supported on a 50,000 volt insulator, and inaddition a 50,000 volt insulator is installed in the pole or structureitself, between the lower portion of the pole and the upper portion towhich the conductors are attached, substantially the same amount ofinsulation between conductors and earth is provided as will be providedif each individual conductor the earth.

The benefits derived from insulating the.

upper portion of a pole or tower supporting high tension conductors isby no means limited to the saving in the total amount of insulationrequired, as outlined above, but such construction makes it feasible togreatly reduce the maximum strain upon the insulators re sulting fromlightning disturbances, this result being accomplished by the use of socalled counter potential wires in a manner and by methods known to theart. Also, by means of properly arranged construction workmen areenabled to work upon conductors which arealive, either intentionally orotherwise, with relative safety as compared with working on a conductivetype of pole or structure.

Heretofore the only construction used to bring about the desired resulthas been of a temporary nature consisting of replacing some of the metalmembers of a transmission line tower with wood timbers, the wood memhersbeing both in compression and tension, and the use of wooden cross-armson steel towers.

My invention relates to a structure more particularlyadapted for use asa pole for systems where poles of medium lengths and strengths may beused to advantage although my construction may, with slightmodifications, be used for insulating different portions of a steeltransmission line tower. My structure may also be adapted for use as across arm or as a suspension type insulator.

In 11, C hollow, outer compression member of insulating material, suchas porcelain.,-litted with end plates PP, and having tension insulatorsas S1 inside the compression member G. Since the insulator S1 isentirely enclosed its surface is normally dry, but the insulatingqualities of the inner insulator SI maybe greatly improved by fillingthe balance of the space with insulating oil or other suitable liquid asL. In some it they not be economically sound to provide suiiicientinsulation to prevent a flashorer oi the interior insulator undercertain \0l'l321 conditions but it may be desirable to quoncn the arequickly and for such a purpose arc quenching material, such as carbontetrachloride may he used in place of oil. W hen used as a suspensioninsulator the load is carried entin v by the tension member SI, andQZ-Ii. ;-Tl()r iiember C may be made relatively l girl: and inexpensive.V

l ig. 10 shows a type of construction adapted to be used as a cross-armshown at CA, F 12. There are several materials from which the member Cmay be made such a s commi ial fiber, special compositions consisting ofwood pulp, asbestos ihe itch, (four pounded and impregnated withasphaltic or bituminous conqiounc s, or mixed with Port- The straininsulator SI ma y be of wood is other suitable material. and a? many mayhe i'ised in series as may be desirable for any particular length ofarm, or any particular fiashover voltage. The plates PP may be of anysuitable unit tance over arm is greater om the wire to he noted that theleal-rage di insulator and along the cro than the shortest distance thesteel tower. The leakage ance along the to sion members in the insulatorand the crosr arm, is less than the distance over the outer surface, butthe inner insulators: are always dry, an nece y may be immersed in oil.thus matting it possible to so deslgn structures that the effectiveflashover voltage will be the same for the interior and exterior pathsvIf the insulating members SI are omitted from the tension member in Fig.10, the insulating properties of the cross-arm will be considerablyreduced but the structure will be considerably cheaper than, and willcompare favorably with, wood cross-arms with respect to insulation,first cost and depreciation.

Fi l is a pole consisting of three sections, P1, P2 and P3. The outercompression member may he metal tubing, or may be con st acted of othermaterials or compositions either conducting or non-conducting.Insulating lJlOClES AA are placed between the ections, metal plateTP isplaced at the top and "another plate BP at the bottom. Metal plates MP,Fig. 3, are placed on either side of the insulator A, and the interiortension members T, of both the abutting sections, pass metal plates MP,and are provided with a head or nut N on the outside of the metal plate.With this construction the insulating block is under compression strainonly, and

the tension members of one section are insulated from hetension membersof the adiacent section by proper positioningin the insulating block asshown'in Fig. 2.

The tension members of P1 pass thru the top plate TP and the insulatorA1 and when tightened up they place the outer member of P1 incompression. Similarly the outer member of P2 is placed in compression,and at the same time sections P1 and P2 aresecurely fastened together,and in like manner section P3 is placed in compression and securelyfastened to section P2. Additional sections nay be readily added tothebottom of the pole. p

v In the complete assembly each section is insulated from the adjoiningsectionwith respect to both the exterior and interior members and thetop section. is insulated from earth by the accumulative values of theinsulating blocks A1, A2, etc.

In Figs. 4, 5 and 6 a construction is shown in which the tensionmembers'T are continuous from the top plate TP to the bottom plate BP,and in order that a conducting path will not be established from the topto the bo tom of the pole it is necessary to insert strain insulators,as S1, Fig. 6, inthetension members T. 'The tension members T pass thruthe insulating block A, and thru the metal plate MP, and are fitted withthreaded con-- plings or long nuts, UN, on the outside, bear ing againstplate MP, the adjacent section of the tensionmember being likewisethreaded into the coupling ON. By tightening the couplings CN, therespective sections of the pole are placed in tension, and by tighteningthe nuts N at the top and bottom 01": the pole, the entire assembly isplaced in tension.v This type of construction has an advantage over thatshown in Fig. 1 as it requires fewer holes in insulator A, and theinsulator is, therefore, cheaper to make and less liable to breakage.The tension members T may be provided with oii sets or other springdevicesas shown at SP Fig. 6 in order to provide for member by meansofsuitable bolts H passing thru the exterior of the pole and thru plate F.

tended to such a plate. h that the section P2 'be of metal, butit may Itis not'essential that exterior member 'be of metal itbeing onlynecessary that it thru the insulating block A, and thru the beself-supporting in the sense that it requires no tension membersextending from end to end thereof.

Fig.7 9 shows a pole of two sections, at least one of which, such as P1,is of insulating material. In this type of construction no insulatingblock is required between the seclar as MC may be used'to hold the twosections in proper alinement or a metal plate may be used and thetension members of portions P1 and P2 may be independently fas- It isnot essential be of metal or' it may be of non-conducting material. I

I claim:

1. A pole, for supporting the trical conductors of an electricaldistribution system, which includes two or more exterior, hollow,compression members as sembled end to end insulating blocks between thecompression members and extending into'the interioroii' the pole; metalplates on the exposed end-s of the two terminal compression memberstension members located inside the compression members, passing throughthe insulating blocks and attaching to the plates at either end of theassembly, each tension member containing an insulating portion locatedbetween the portions of the tension member which are attached to therespective end plates.

2. A pole, for supportingthe outdoor electrical conductors of anelectrlcal distribution" system, which includes two or more'ertterior,hollow, compression members'assembled end to end, at least one of saidmembers being outdoor ele cof insulating material; tension plates on theexposed ends of the two terminal members: tension members located in theinterior of the pole and attached to the tension plates at each end ofthe pole; each tension member being provided with an insulating portionpositioned between those portions of the tension member which areattached to the respective tension plates. I

In testimony whereof I have signed my name to this specification.

RALPHC. Ron.

